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Methods and systems for cylinder speed increase control to improve combustion uniformity

  • US 9,732,722 B1
  • Filed: 03/06/2015
  • Issued: 08/15/2017
  • Est. Priority Date: 03/06/2015
  • Status: Active Grant
First Claim
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1. A method for controlling an internal combustion engine having a plurality of cylinders containing pistons that cause rotation of a crank shaft, the method comprising:

  • sensing a rotational speed of the crankshaft for an engine cycle;

    calculating a speed increase of the crankshaft for each of the plurality of cylinders caused by a combustion event in that cylinder;

    calculating an average speed increase as the average of the speed increases for the plurality of cylinders; and

    controlling a spark time for each of the plurality of cylinders based on a difference between the speed increase for the respective cylinder and the average speed increase to cause a subsequent speed increase for each of the plurality of cylinders to be closer to the average speed increase;

    wherein controlling the spark time for each of the plurality of cylinders includes calculating a spark time offset for each of the plurality of cylinders, by configuring a proportional-integral-derivative (PID) controller for each of the plurality of cylinders to calculate the spark time offset for the respective cylinder using the average speed increase as a setpoint and the speed increase for the respective cylinder as feedback.

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